摘要
文中基于熔池凝固收缩和补缩理论开发了临界固相率与Niyama判据相结合的余高判据式程序,并采用它对20 mm厚2219高强铝合金未熔透电子束焊焊缝余高产生原因进行了模拟探索和试验验证.结果表明,焊缝的中上部区域存在有大量凝固阶段未收缩的疏松间隙,这些间隙体积的存在导致了焊缝表面余高的形成.通过计算和与试验件对比可知,模拟得到的余高尺寸和焊缝体积膨胀率误差分别在11%和23.67%左右,可见采用余高判据式程序能够对焊缝余高的产生进行合理地数值预测.
A criterion program for weld reinforcement that combined critical solid fraction and Niyama criterion was developed based on solidification shrinkage and feeding theory in molten pool. It was adopted to numerically investigate the formation of weld reinforcement of 20 mm thick non-penetrated 2219 high strength aluminum alloy electron beam weld,and the results was experimentally verified. It was found that a large number of loose interspaces that formed upon solidification distributed in the upper-middle part of weld seam,which promoted the formation of reinforcement. The simulated reinforcement and volume expansion ratio errors were 11% and 23. 67%,respectively. Therefore,The proposed criterion program in this paper can be used to reasonably predict the reinforcement.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2016年第2期111-114,134,共4页
Transactions of The China Welding Institution
关键词
余高判据式
未熔透电子束焊
凝固收缩
数值预测
reinforcement criterion
non-penetrated electron beam weld
solidification shrinkage
numerical prediction
